Engine Calculator
by Scott Henderson

RPM calculator

Gear Ratio Tire Radius MPH
RPM =

CFM needed

Engine size (cid) Max RPM Volumetric Efficiency *
CFM Needed =

* 1.0 is a good estimate for a mild performance engine

Horsepower From MPH Calculation:

1/4 Mile
Speed (mph)		 Vehicle
Weight (lbs.)		   Horsepower

Liter/CID Conversions:

Liters Cubic Inches

Displacement Calculation:

Bore Stroke # of Cylinders
CID=

Miles per Gallon:

Miles
Travelled		 Gallons
Used		   Miles Per Gallon

Kilometers per Liter:

Kilometers
Travelled		 Liters
Used		   Kms Per Liter

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Used with permission by SCOTT HENDERSON